Roaster.



R. HOLMAN. MASTER. .AYIPLIUATION FILED APR. 28, 1913.

Patented Sept. 22, 1914.

2 SHEETS-SHEET 1.

#WE/vrage /EWJJELL 0L/mfr R. HOLMAN.

MASTER.

APPLIGATIQN FILED APR. 28, 1913. l I v 1 1 1 1 ,46 1 Patented Sept. 22,1914.

2 SHEETS-SHBET 2.

' RUSSELL HOLMAN, or MINNEAPOLIS, MINNESOTA.

ROASTER.

Specification of Letters Patent. l Application med April 25,1913.

Patented Sept. 22, 1914. Serial No. 764,095.

. To all whomt may concern:

Be :it known that I, RUSSELL HOLMAN, citizen of the United States,resident of Minneapolis, county of Hennepin, State of Minnesota, haveinvented certain new and useful Improvements in Roasters, of -which thefollowing is a specification.

My invention relates to an apparatus for roasting purposes, generallyand particularly adapted for roasting codec.

rThe object of my invention is to improve u the apparatus shown anddescribed in my pending a plicatio-n for Letters Patent of the UniteStates filed January 3', 1913, Serial No. 739,970. E

y :The invention consists generally in various constructions andcombinations, all as hereinafter described and particularly pointed outin the claims. .l

Iii the accompanying drawings forming part of this specification, Figure1 is a longitudinal sectional view of a roaster embodyin my invention,Fig. 2 is a transverse vertica sectional view on the line w-w of Fig. 1.i u v In the drawing, 2 and 3 represent suitable cast heads, betweenwhich is a casing 4, forming with said heads a stationary Jacket inwhich-the yroaster proper .is arranged. The heads 2 and 3 are supportedby suitable A--me ans, such as legs 5. -The head 2 has a hopper 62communicating through an opening 7 with the interior of the casing. Saidhopper also communicates through a, p ipe 8 with a vent pipe 9 providedpreferably in the top of the casing 4. Suitable -danipers' 10 and 11 aremounted inthe plipes Sand 9 for controlling the .flow of t e hot airfrom the casing during the roasting operation and regulating thecirculation of the cold air during the lprocess of cooling the coifee.In

I i the lower part of the head 2 is a spout 12 perforati'ons 17 throu hwhich the heated communicating with a discharge openin 13 normallyclosed by a hinged door 14. h en this door .is opened the coffee may bedischarged from the roasting cylinder;

' l,Within the stationary casing is a revolving cylinder 15, spaced fromthe walls of the Casing tonforin an annular air circulating passage 16and provided with `a series of and cold airmay circu ate freely duringthe roasting and cooling operation. A shaft 1 8 is journaled. inbearings 1 9 and 20 and 1s provided with a gear 21 driven from a shaft22. The cylinder 1,5 is ope-n at each end, one i with an opening 25inthe head 3, as shown plainly-in Fig. 1.

A drum 26, preferably inclosed within a Jacket 26 ofasbestos, or othernon-heat conducting material, is secured to the head 3 and covers theopening 25, and mounted in the end of this opening are a series of ,gasburners 27, at suitable intervals apart, preferably arranged in a circlearound a central opening 28 having a valve 29 for regulating the flow ofair into the drum. These burners are connected by pipes 30 with asuitable gas supply pipe 31 having a controlling valve 32. .A branchpipe 33 leads from the gas supply pipe to a point near the opening 28,which may be ignited through said opening to supply a iiame for ignitingthe main burners as they may be required, each burner having an ordinarygas cock 34 so that as many burners may be used in the operation of themachine as seems necessary. The'burners are arranged opposite theopening 25 and preferablv spaced the length of the drum 26 therefrom,and the air enteringv the opening 28 will be thoroughly heated and willpass through the opening 25 into the roasting cylinder, 'while theburner flames will be spaced a suliicient distance from the cylinder. toprevent scorching of the coffee or the delivery of gas to that portionof the cylinderiin which the coffee is being treated.

For the purpose vof increasing the suction and drawing the heated airinto the revolving cylinder, I prefer to provide a series of wings Aorblades 35, mounted on-the inner Walls of the cone 23 and preferablytriangular in form, tapering gradually from their inner toward theirouter ends. These blades, in the operation of the cylinder, will greatlyincrease the roasting eiiiciency ofthe machine without adding materiallyto the eX- pense of construction. There may be any suitable number ofthese blades, according to the sizeof the cone, but I have found thenumber and shape shown to be productive of the best results. Theinterior of the roastsection 37, which will collect the flying refusematerial from the roasting cylinder and allow for its convenient removalfrom the machine.

For the purpose of cooling the coffee after the roasting operation, Iprefer to provide a trunk 38 at one end ofthe casing between its wallsand the cone 33, said trunk being curved in cross section to fit thespace be tween the casing and cylinder and 'connected with a pipe 39leading to a suctionl fan 40. .l valve 41 is provided in this pipe 39and normally will be closed duringthe roasting operation. When thecoii'ee is roasted and it is desired to cool the berries, the valve 41will be opened and also the valve 10, while the valve 11 will be closed.-The fan 40 will thenbe set in mot-ion and currents of cold air will bedrawn in through the branch pipe 8 and the opening 7 into the interiorof the vroasting cylinder and will low in" and around the coiee andthrough the perforations in therevolving cylinder before reaching thetrunk 38. The cylinder' will be revolved 'during' this cooling processand all parts of the coii'ee berries will be exposed to the action ofthe cool air.

I claim as myinventionz- 1. A roaster comprising a casing having anexhaust or vent '.opening, a cylinder mounted to revolve 4within saidcasing and having perforations inits walls and spaced from the walls ofsaid-'casing and also provided with a lling opening through which thematerial to be roasted may be delivered, said cylinder also having anair intake opening, a drum communicating with said opening and having anair intake opening, means for heating the air in said drum, and meansfor creating a suction through said cylinder and increasing. thecirculation of hot air therethrough.

2. A roaster comprising a casing having an exhaust or vent opening, acylinder mounted'to revolve .within said casing and having a fillingopening. and an open end,'a drum communicating with the open lend ofsaid cylinder and having an air intake, a series of burners mounted toheat the air in said drum, and a series of suction blades mounted torevolve with said .cylinder and create a suction of hot air through theopen end of said cylinder.

3. A roaster comprising a casing having an exhaust or vent opening, acylinder having perforations in its walls and provided with an intakeopening and mounted to revolve within said casing and having one lend'ed on thewalls of said truncated :cone and operating touinerease thecirculation of hot airA through the" open end of said cylinder ndthrough the lmaterial within said @vlin-` er" if V- 4. Aroasterfcompmsmgf ad casmg'having an. exhaust or vent '-.o ening, acylinder' 1 mounted to revolve' wit in said c'asingand spaced from thewalls thereof and vhaving a filling opening and perforations in itswalls and also havin a'1"1open.end,`a drum communicating wit said'open'l end and having an air intake and burners for heating 'the airwithi'n said drum, the heatedair from said drumentering 'said cylinder.andpass ing through 'the perforations therein and circulating aroundsaid cylinder' and through the material to be roasted, and a cold nair.trunk mounted to draw cold air in to thespace' between 'said cylinderand said casing. n

45. A roaster comprising heads mounted in arallel relation and spaced aart and a Jacket secured -to said heads an forming a stationary casing,the wall of said casing having a vent opening therein, a cylindervmounted to revolve wlthin` said casing and spaced from the walls thereofand'forming an annular passage said casing having perforationsA inv itswalls, andanopen end, a drum mounted in one of said casing heads andcommunicating with the open end of said cylinder andhaving an airintakeopening, "a series of burners mounted adjacent to said drum, theair entering said drum be-v iiigheated and `means for sucking the heatedair intoA the-open end of said cylinder and through and around thematerial therein.

i 6. A roaster comprising a casing having a vent er Iexhaust pipetherefor and a hop# per mountedat one end 'of said casing' and aving abranch pipe leading to said exhaust pipe, valves for said exhaust lpipeand said branch pipe, a'cylinder mounted to revolve within said casingandv havmg erforations in its l`walls and spaced, from t e walls of saidcasing to forman annular air passage,

said cylinder also -having an opening comi municating with thedischargeopening of said hopper, said cylinder being also provided withan open end andmeans for di recting currents of hotair into said openend, the air flowing through said perforations and the material withinsaidcylinder and circulating in the annular passage between saidcylinder and casing, a cold air trunk communicating with said annularpas-` sage, a suction fan connected with said air trunk, a valvenormally closing the passage through said trunk, said trunk valves' andsaid branch pipe valve being opened to allow currents of cold air to Howinto said cylinder and through the perforations therein to cool thematerial in said cylinder.

4 7. AV roaster comprising a casing having an exhaust or vent opening, acylinder mounted to revolve within said casing and having perforationsin its walls and spaced fromv the walls of lsaid casing and alsoprovided with a lling o ningnsaid cylinder 'also having an air inta eopening, a cone eiito revolve within said casin and having perforationsin its walls an spaced from the walls of said casing and' also providedwith a filling opening, said cylinder also having an airl intakeopening, an imperiorate wall encircling said opening, a heating drumcommunicating with said cylinder through said wall, means for heatingthe air in said drum, a circulation of heated air being establishedthrough said drum into said cylinder.

In Witness whereof, I have hereunto set my hand this 22nd day of April,1913.

RUSSELL HOLMAN. I

